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LTE_Connected Mode Mobility
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RA4121BEN40GLA0
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In order to achieve Lossless HOs packets are forwarded from the source to the target.
Depending on each bearer's QoS profile, the eNodeB shall decide whether data forwarding should be applied to it during the handover or not.
The GTP-U message End Marker is used for ever EPS bearer which is subject to a HO.
The End Marker is an indication of the last DL T-PDU (i.e. user data SDU) to source eNB is expected from the EPC.
The end marker is a special GTP-U PDU which carries no data.
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Load Supervision and Exchange DL GBR and DL nGBR cell load is periodically measured
and exchanged between cells of the same eNB
Upon measuring cell load, the cell evaluates load to determine whether to stay, enter or exit Active LB state
Candidate UE Selection for measurement solicitation UEs which switch from Idle to Connected states are
considered candidates for measurement solicitation
Triggered HOs eventually reduces load for the highly-loaded cells, since already connected UEs will not be offloaded
Special treatment for QCI1 bearers Depending on iFLBBearCheckTimer, UE which
establishes QCI1 bearers may be removed from candidate UEs
Measurement Solicitation For each candidate UE, if serving eNB is highly loaded,
A4 measurements of different frequency neighbor cells is activated
RSRP and RSRQ measurements from received A4 reports are post-processed to select best target cell for UE offloading
iF-LB Execution Normal handover procedure to offload candidates UEs to
selected target cells
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iFLBLoadFilCoeff hard coded parameter non modifiable
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Available Capacity(AC) is taken by normalizing GBR/nGBR load by the configurable GBR/nGBR target load (iFLBTargetLoadGBRDL and iFLBTargetLoadNonGBRDL, respectively)
The AC values are then exchanged between cells of the same eNB periodically
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In each cell, whenever new load measurements are calculated (LoadGBR,DL,LoadnGBR,DL), the cell load is evaluated
The calculated load measurements are evaluated against load thresholds (target and high load thresholds) to determine load status of the cell
Enter Active iF-LB State GBR OR nGBR load measurement exceed the high-load thresholds
Leave Active iF-LB StateGBR AND nGBR load measurement are below the target load thresholds
Difference between target load and high load thresholds provides hysteresis to prevent ping-pong between iF-LB state transitions
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*Note: depending on settings for iFLBBearCheckTimer, condition 3 may be excluded
Feature Group Indicator
Defines which features are supported by UE.
BIT13 Inter-frequency Handover
BIT14 A4 and A5 measurements/reporting
BIT25 interfrequency measurement and reporting in connected mode.
reportTimerIFLBA4 - hard coded -non modifiable
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A4 Configuration hard-coded and NOT configurable
Reported cells would be post-processed to remove cells with insufficient RSRP and/or RSRQ.
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